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. Abbreviations and . Fob, BMI, body mass index; SAPS II, Simplified Acute Physiologic Score II; ODIN, Organ Dysfunction and Infection score; PaO 2 /FiO 2 , ratio of partial oxygen pressure in arterial blood over inspired fraction of oxygen; PaCO 2 , partial carbon dioxide pressure in arterial blood; RR, respiratory rate; HR, heart rate; SBP, systolic blood pressure; PT, prothrombin time